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Lodash _.unsplatl() Method

  • Last Updated : 18 Sep, 2020

The Lodash _.unsplatl() method takes a function expecting an array as its first argument and returns a function that works identically, but takes a list of leading arguments. It is similar to the unsplat() method. It mimics the rest parameter syntax in ECMAScript 6.

Syntax:

_.unsplatl( function )

Parameters: This method accepts a single parameter as mentioned above and discussed below:

  • function: It is the original function that takes its first argument as an array.

Return Value: This method returns a function.

Note: To execute the below examples, you have to install the lodash-contrib library by using this command prompt and execute the following command.



npm install lodash-contrib

Example 1:

Javascript




// Defining lodash contrib variable
var _ = require('lodash-contrib'); 
  
function g (arr, val) {
    return val+" : "+arr;
}
  
var gfgFunc = _.unsplatl(g);
  
console.log(gfgFunc(10, 20, 30, 40, "A"))

Output:

A : 10, 20, 30, 40

Example 2: 

Javascript




// Defining lodash contrib variable
var _ = require('lodash-contrib'); 
  
function g (arr) {
    return arr;
}
  
var gfgFunc = _.unsplatl(g);
  
console.log(gfgFunc(1, 2, 3, 4))

Output:

[ 1, 2, 3, 4 ]

Example 3: 

Javascript




// Defining lodash contrib variable
var _ = require('lodash-contrib'); 
  
function g (arr,val) {
    return arr.join(val);
}
  
var gfgFunc = _.unsplatl(g);
  
console.log(gfgFunc("GeeksforGeeks", "Computer Science Portal for Geeks", " : "))

Output:

GeeksforGeeks : Computer Science Portal for Geeks



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